Tire Loosing Air

[Andrew Dickinson]

LOL... J'ai mal a la tete avec le fromage dans la poubelle!




________________________________
From: Hayes Myers <hayesmyers at gmail.com>
To: audi at humanspeakers.com
Cc: quattro at audifans.com
Sent: Sun, January 23, 2011 2:28:15 PM
Subject: Re: Tire Loosing Air

mais oui!

2011/1/23 Huw Powell <audi at humanspeakers.com>

> What Louis-Alain said.  It works in English, too ;)
>
> On 1/23/2011 11:50 AM, Andrée-Anne Bourgeois wrote:
> > Not that much for sure... In fact, you have it almost the opposite.
> >
> > The formula for perfect gases is (in French) : PV=nRT
> >
> > P is pressure in kPa
> > V is volume in liter
> > n is the quantity of gas in mole
> > R is the perfect gases constant
> > T is temperature in Kelvin
> >
> > So, for a fixed volume and quantity of gases, pressure change is directly
> > proportional to temperature change (temps are evaluated in absolute
> Kelvin
> > only).
> >
> > Then, if the temp drops by 10F between 68F (293K) and 58F (288K) (that
> would
> > be about 5 Kelvin, more or less), that would lead to a drop in pressure
> of
> > about 1% (293/288).
> >
> > So, if you filled your tires in October at 50F (283K) and now temp is 0F
> > (255K), pressure would drop by 10% (255/283= 0.90).
> >
> > On a car with 32 psi, that's a loss of 3 psi.
> >
> >
> > So a crude rule of thumb could be 3 psi per 50F or 1 psi per 15F.
> >
> > Louis-Alain
> >
> >
> >
> > -----Message d'origine-----
> >
> > Isn't there a formula, for every degree below freezing, that a tire
> looses
> > 10 psi?
> >
> >
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> >
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/
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